The search for a suspect in the killing of Baltimore Police Det. Sean Suiter entered a sixth day Tuesday — putting the case in uncharted territory for an agency with a recent track record of quickly apprehending killers of its own.
Since 1964, suspects in the killings of city officers have been caught within a few days, according to news accounts and a book, “Some Gave All,” which documents each line-of-duty death in the agency’s history. Even in the case of the three-month manhunt for the Veney brothers in 1964, the siblings were developed as suspects at the crime scene.

